<html>
<head>
<title>WebSocket</title>

<style>
 html,body{font:normal 0.9em arial,helvetica;}
 #log {width:440px; height:200px; border:1px solid #7F9DB9; overflow:auto;}
 #msg {width:330px;}
</style>

<script>
var socket;

function init(){
  var host = "ws://127.0.0.1:1234/";
  try{
    socket = new WebSocket(host);
    socket.onopen    = function(msg){ ; };
    socket.onmessage = function(msg){ log(msg.data); };
    socket.onclose   = function(msg){ log("Lose Connection!"); };
  }
  catch(ex){ log(ex); }
  $("msg").focus();
}

function send(){
  var txt,msg;
  txt = $("msg");
  msg = txt.value;
  if(!msg){ alert("Message can not be empty"); return; }
  txt.value="";
  txt.focus();
  try{ socket.send(msg); } catch(ex){ log(ex); }
}

window.onbeforeunload=function(){
	try{ 
		socket.send('quit'); 
		socket.close();
		socket=null;
	}
	catch(ex){ 
		log(ex);
	}
};


function $(id){ return document.getElementById(id); }
function log(msg){ $("log").innerHTML+="<br>"+msg; }
function onkey(event){ if(event.keyCode==13){ send(); } }
</script>

</head>



<body onload="init()">
 <h3>WebSocket</h3>
 <br><br>
 <div id="log"></div>
 <input id="msg" type="textbox" onkeypress="onkey(event)"/>
 <button onclick="send()">发送</button>
</body>

</html>
